Hot-blast stove



3 Sheets-Sheet l.

(No Model.)

H. KENNEDY.

HOT BLAST STOVB.

No. 429,725. PatentedJune 1o, 1890.

(No Model.) 3 Sheets-She'fl 2.

H. KENNEDY.

1 HOT BLAST STOVB.

No. 429,725. Patented June 10, 1890.

3 Sheets-Sheet 3.

v(No Mom.)

H. KENNEDY.

HOT BLAST sTovE.

INVENTOR ma norms versus coA, mura-uwe., msumccw. n4 c.

UNITED STATES HUGH KENNEDY, OF SHARPSBURG, PENNSYLVANIA.

H OT-BLAST STOVE.

SPECIFICATION forming part of Letters Patent No. 429,725, dated June 10, 1890.

Application filed September 27, 1889. Serial No. 325,271. (No model.)

To all whom t may concern:

Beit known that I, HUGH KENNEDY, of Sharpsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and usefullmprovement in Hot-Blast Stoves, of which the following is a full, clear, and eX- act description, reference being had to the accompanying drawings, forming part of this specification, in which- Figure 1 is a vertical central section of my improved stove on the line I I of Figs. 2 and 3. Fig. 2 is a horizontal cross-section on the line Il lI of Fig. 1. Fig. 3 is ahorizontal crosssection on the line Ill lll of Fig. 1. Fig. l is a vertical central section of a modified form of the stove.

Like symbols of reference indicate like parts in each.

My invention relates to vertical hot-blast stoves which are heated by the waste gases from the furnaces and are utilized to heat the blast. These stoves are provided with valves for reversing` the currents by which they are traversed, so that at one time the waste heat from the furnaceis passing through them in one direction, and later the blast of air from the blowing-engine is being forced through them in the opposite direction into the furnace. They are used in couples, so that while the waste heat is passing out through one or more, heating them up, the blast is being forced in through an equal number, which have been previously heated by the passage therethrough fora time of the hot waste gases. Vhen one set becomes heated and the other cold by the currents passing through them, the valves are reversed, and then the-currents pass in the opposite directions.

My invention relates to that class of stoves in which the interior is composed ofia series of vertical channels through refractory brickwork and designed to give a long run to the gases and air over the same for the purpose of taking up from the hot gases all the heat contained therein and to impart the same in turn to the inflowing air.

l Referring to the figures on Sheets 1 and 2 of the drawings, the stove has a cylindrical metallic shell 2, lined with brick work 3. The stove is divided into several passes by a number of vertical partition-walls 4, 5, and 6, of

which "I have shown three, thus dividing the stove into four passes, though it should be understood that my invention is not limited strictly to this number of passes, since by suitable modifications, such as will suggest themselves to skilled blast-furnace engineers, the construction may be'modied so that the stove shall afford other numbers of passes. Each of the passes l), c, (Z, and e is preferably divided into numerous small passages or flues by brick work arranged in the manner shown in Figs. 1 and 2, or otherwise, and below this brick work the tlucs are open Vto form combustion-chambers, in which gas and air are burned for the purpose of heating the stove. The walls l, 5, and 6 are arranged so as to afford communication between the flues Z) c d e at alternate ends thereof. Thus the walls 4 and 6 extend from the bottom of the stove toward but not to the top, While the wall 5 extends to the top, and at the base is provided with arched openings 7, connecting the tlues c and (l. On each side of the partition-wall 5, at the top of the stove, is a stack-flue or chimney 8 9, each of which has a suitable valve 10, and at the base of the stove are pipes 1l, for the admission of the gas and air by which the stove is heated as a preliminary to forcing the blast therethrough. I have shown four of these gas and air inlet-pipes, one for each of the vertical passes of the stove; but, it' desired, a single inlet-pipe may be used forboth of those lines which communicate at the base-z'. c., the fines c and d.

11 are man-l'1oles,by which access may be had to the interior of the lower part of the stove for cleaning it.

The stove is also provided with the usual adit-pipe 12, leading from the air-blowing engine, and an exit-pipe 13, leading to the blastfurnace. These pipes communicate with valve-chambers 14E and 15 of the usual construction.

ln the operation of the stove the vertical flues are first heated by admitting air and gas through the pipes 11 and burning the gas in the combustion-chambers at the bases of the flues. The burning gases ascend through each of the tlues l) c CZ c and escape directly therefrom through the stacks 8 and 9, the stack S serving to carry off the products of IOO combustion from the tlucs d c on one side of the Vertical wall 5, and the stack J to perform the same function for the ilues on the other side of this wall. Then the stove has been properly heated, thc air and gas are shut oil from entering the pipes 11, the Valves l are closed, the valves liand l opened, and the air-blast is admitted through the valve-chamber li. The air passes in succession through the several fines b, c, (Z, and c, as shown by the arrows in Fig. l, and escapes through the fine 1 3, leading to the blast-fu rnaee, thus passing through the entire heating-space of the stove and utilizing the whole thereof in supplying heat to the blast.

In Fig. i the construction of the furnace is the saine as that above described, except that instead of having four passes for the air there are but two passes, there being but a single internal partition-wall G extending toward but not up to the top of the stove. This is desirable for some reasons, principally because as the vertical wall does not extend to the top its expansion and contraction in the heating` ot' the stove will not displace or injure the arch or crown. The fact that there is only one staek-opening in the arch makes the stove easy to construct and makes it strong and durable.

It will be seen that the construction of Fig. l isa duplication of that of Fig. 4, in that while in Fig. t I show but one pair of lines communicating at the crown of the furnace and having a common staelefiue, in Fig. l I show two such pairs separated by the central wall 5.

The feature of construction in which my invention consists is the construction of the stove with at least a pair of ilues separated by a Vertical flue-wall and communicating at the upper portion of the stove, said [lues having air and gas inlets at their bases, a coinmon outlet at the top and an air-blast inlet and outlet from and to which thc air passes in series through the fines.

Within the limits of the construction above stated the stove may be modified in form 'in various ways.

rThe advantages of my invention will be appreciated by those skilled in the art. The stove is simple and cheap in construction, and by reason of the direct passes for the gas it is easy te heat, is economical in the amount of gas necessary to be consumed, and is otherwise Ver Y desirable.

I claim as my inventionl. In a hot-blast stove, the combination of a pair oi' fines separated by a vertical fluewall and comnmnieating at the upper portion of the stove, said fines having air and gas inlets at their bases, a common outlet at the top, and an air-blast inlet and outlet from and to which the air passes in series through the tlues, substantially as and for the purposes described,

2. In a hot-blast stove, the combination of a pair of flues separated by a vertical fluewall and communicating at the crown of the stove above said wall, said ilues having air and gas inlets at their bases, a common outlet at the top, and an air-blast inlet and outlet from and to which the air-blast passes in series through the lines, substantially as and for the purposes described.

In testimony whereof I have hereunto set my hand this th day of September, A. I).

.IIUGII KENNEDY.

Iitnessesz 1 W. I). CoRwIN, JNO. K. SMITH. 

